85611139 has 2 divisors, whose sum is σ = 85611140. Its totient is φ = 85611138.

The previous prime is 85611137. The next prime is 85611187. The reversal of 85611139 is 93111658.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85611139 - 2¹ = 85611137 is a prime.

Together with 85611137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (85611137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42805569 + 42805570.

It is an arithmetic number, because the mean of its divisors is an integer number (42805570).

Almost surely, 2^85611139 is an apocalyptic number.

85611139 is a deficient number, since it is larger than the sum of its proper divisors (1).

85611139 is an equidigital number, since it uses as much as digits as its factorization.

85611139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6480, while the sum is 34.

The square root of 85611139 is about 9252.6287616007. The cubic root of 85611139 is about 440.7342063471.

The spelling of 85611139 in words is "eighty-five million, six hundred eleven thousand, one hundred thirty-nine".